Next airing Thu Mar 29, 1 p.m. ET

Freaks in the Ocean

Sea slug orgies; hermaphrodite flatworms; fish that walk on land and lizards that walk on water' dive in with the World's Weirdest underwater creatures. Flounders have a migrating eye that moves to one side of their face, enabling them to lie flat on one side for hunting. And a mimicking octopus not only changes colors but can emulate anything from rocks to snakes.